Professor Robert Weinberg explains how normal cells can only double a certain limited number of times; and cancer cells have to learn how to proliferate indefinitely, i.e, they have to become immortalized.

Professor Douglas Hanahan, discusses that due to the nature of the replication machinery chromosomes get smaller every time they divide, and that we now appreciate that specialized cells in the body have a way to counteract this telomere shorting.

Nobel Prize week kicked-off today with the announcement of the Prize in Physiology or Medicine. Elizabeth Blackburn, Carol Greider, and Jack Szostak will share the award for discovering telomeres and telomerase. Dr. Bruce Stillman, President of Cold Sprin